OK, so I'm a totally noob.  Never mined at all.

I'm trying to get a handle on potential mining outcomes.  On litecoinminingcalculator, I plug in 12500 khs (1/20 total) @ 5797.27800722 difficulty with a 3% fee.  This returns

2.1 LTC / Day
(Diff. 5797.27800722)   
63.11 LTC / Month
768.37 LTC / Year

Is that a decent ballpark or am I not plugging in the right numbers?  What is a reasonable hope for break even and how long do we estimate the machine would be viable?